A 40Gb/s InP-monolithically integrated DPSK-demodulator enhanced by cross-gain-compression in an SOA

We fabricated and experimentally tested a novel monolithically integrated Indium Phosphide optical circuit for differential phase-shift keying demodulation, which is robust to noise degradations of the received signal. The circuit consists of a one-bit-delay interferometer that demodulates the incom...

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Bibliographic Details
Published in:Optics communications 2015-04, Vol.340, p.155-158
Main Authors: Bontempi, Francesca, Faralli, Stefano, Leijtens, Xaveer J.M., Bolk, Jeroen, Contestabile, Giampiero, Andriolli, Nicola
Format: Article
Language:English
Subjects:
DPSK demodulation
Integrated optics
Photonics
Signal regeneration
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Summary:We fabricated and experimentally tested a novel monolithically integrated Indium Phosphide optical circuit for differential phase-shift keying demodulation, which is robust to noise degradations of the received signal. The circuit consists of a one-bit-delay interferometer that demodulates the incoming signal and a semiconductor optical amplifier where the constructive and destructive demodulated outputs synchronously counter-propagate experiencing a reshaping effect. The novel optical circuit has been fabricated for 40Gb/s signals, and the amplitude signal restoration is demonstrated by comparing the obtained output eye diagrams with those of a commercial fiber-based demodulator. We find a net improvement in the signal to noise ratio when the circuit is fed with a noisy input signal.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2014.11.097